class Person{
  String name;
  int age;
  String _name = "小王";
  Person(name,age){
    
    //构造函数,实例化对象后第一个执行的
      this.name = name;
      this.age = age;
  }
  int getUname(){
    print("getUname =============return---------------->");
    print(this._name);
    return this.age;
  }
  void setAge(){

    this.age = 99;
  }
  String getUnamew(){

    return this._name;
  }
  void _joinNow(){
    // 内部函数
    print(this.age);

  }


}